<?php

namespace app\nideshop\service;

/**
 * 微信支付服务文件
 * Create on : 2020-05-24
 * Autor fanzhongxing
 */

class WeixinPay
{
    protected static $mchid;
    protected static $appid;
    protected static $apiKey;

    public function __construct($mchid, $appid, $key)
    {
        self::$mchid = $mchid;
        self::$appid = $appid;
        self::$apiKey = $key;
    }

    /**
     * 发起订单
     * @param float $totalFee 收款总费用 单位元
     * @param string $outTradeNo 唯一的订单号
     * @param string $orderName 订单名称
     * @param string $notifyUrl 支付结果通知url 不要有问号
     * @param string $timestamp 订单发起时间
     * @param string $type 类型
     * @param string $openId
     * @return array
     */
    public static function createJsBizPackage($totalFee, $outTradeNo, $orderName, $notifyUrl, $timestamp, $type, $openId = "")
    {
        $unified = array(
            'appid' => $this->appid,
            'attach' => 'pay',             //商家数据包，原样返回，如果填写中文，请注意转换为utf-8
            'body' => $orderName,
            'mch_id' => $this->mchid,
            'nonce_str' => self::createNonceStr(),
            'notify_url' => $notifyUrl,
            'out_trade_no' => $outTradeNo,
            'spbill_create_ip' => $_SERVER["REMOTE_ADDR"],
            'total_fee' => intval($totalFee * 100),       //单位 转为分
            'trade_type' => $type,
        );
        if ($type == 'JSAPI') {
            $unified['openid'] = $openId;
        }
        $unified['sign'] = self::getSign($unified, $this->key);
        $responseXml = self::curlPost('https://api.mch.weixin.qq.com/pay/unifiedorder', self::arrayToXml($unified));
        $unifiedOrder = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
        if ($unifiedOrder === false) {
            die('parse xml error');
        }
        if ($unifiedOrder->return_code != 'SUCCESS') {
            die($unifiedOrder->return_msg);
        }
        if ($unifiedOrder->result_code != 'SUCCESS') {
            die($unifiedOrder->err_code_des);
        }
        $codeUrl = (array)($unifiedOrder->code_url);
        if ($type != 'JSAPI'){
            if(!$codeUrl[0]) {
                exit('get code_url error');
            }
        }
        $arr = array(
            "appId" => $this->appid,
            "timeStamp" => $timestamp,
            "nonceStr" => self::createNonceStr(),
            "package" => "prepay_id=" . $unifiedOrder->prepay_id,
            "signType" => 'MD5'
        );
        if ($type != 'JSAPI') {
            $arr["code_url"] = $codeUrl[0];
        }
        $arr['paySign'] = self::getSign($arr, $this->key);
        return $arr;
    }

    /**
     * 回调通知
     * @Author   fanzhongxing
     * @DateTime 2020-05-24T20:49:40+0800
     * @return   [type]                   [description]
     */
    public function notify()
    {
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
        if ($postObj === false) {
            die('parse xml error');
        }
        if ($postObj->return_code != 'SUCCESS') {
            die($postObj->return_msg);
        }
        if ($postObj->result_code != 'SUCCESS') {
            die($postObj->err_code);
        }
        $arr = (array)$postObj;
        $sign = self::getSign($arr, $this->key);
        unset($arr['sign']);
        if (self::getSign($arr, $this->key) == $postObj->sign) {
            echo '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
            return $postObj;
        }
    }

    /**
     * curl发送请求
     * @Author   fanzhongxing
     * @DateTime 2020-05-24T20:50:53+0800
     * @param    string                   $url      [description]
     * @param    string                   $postData [description]
     * @param    array                    $options  [description]
     * @return   [type]                             [description]
     */
    public static function curlPost($url = '', $postData = '', $options = array())
    {
        if (is_array($postData)) {
            $postData = http_build_query($postData);
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
        if (!empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https请求 不验证证书和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }

    /**
     * 生成随机字符串
     * @Author   fanzhongxing
     * @DateTime 2020-05-24T20:53:44+0800
     * @param    integer                  $length [description]
     * @return   [type]                           [description]
     */
    public static function createNonceStr($length = 16)
    {
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        $str = '';
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    /**
     * 数组转化xml
     * @Author   fanzhongxing
     * @DateTime 2020-05-24T20:54:28+0800
     * @param    [type]                   $arr [description]
     * @return   [type]                        [description]
     */
    public static function arrayToXml($arr)
    {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
            } else
                $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
        }
        $xml .= "</xml>";
        return $xml;
    }
    
    /**
     * 获取签名
     * @Author   fanzhongxing
     * @DateTime 2020-05-24T20:55:01+0800
     * @param    [type]                   $params [description]
     * @param    [type]                   $key    [description]
     * @return   [type]                           [description]
     */
    public static function getSign($params, $key)
    {
        ksort($params, SORT_STRING);
        $unSignParaString = self::formatQueryParaMap($params, false);
        $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
        return $signStr;
    }


    /**
     * [formatQueryParaMap description]
     * @Author   fanzhongxing
     * @DateTime 2020-05-24T20:55:34+0800
     * @param    [type]                   $paraMap   [description]
     * @param    boolean                  $urlEncode [description]
     * @return   [type]                              [description]
     */
    protected static function formatQueryParaMap($paraMap, $urlEncode = false)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if (null != $v && "null" != $v) {
                if ($urlEncode) {
                    $v = urlencode($v);
                }
                $buff .= $k . "=" . $v . "&";
            }
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }
        return $reqPar;
    }
}